Fountain pen



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@Tm/way Patented Apr. 14, f 1936I 'UNITED STATES PATENT ori-ice FOUNTAINPEN Nathan W. Paquette, Janesville, Wis., assigner to The ParkerPen'Company, Janesville, Wis., a corporation oi' Wisconsin ApplicationMarch '22, 1934, serial No. 716,782

1 claim. (ci. 12o-746) My invention relates to fountain pens andparticularly to that class lgenerally designated as pump fillers. Moreparticularly it relates to the class of pump ller pens that employ agrubber diaphragm which, when actuated, tends to create a partial vacuum4within the barrel to draw ink thereinto through the apertured section.An analogous `device is disclosed in the patent to Arthur O.Dahlberg,`Number 1,904,358, April 18, 1933. However, inthe instance ofthe Dahlberg structure the rubber diaphragm is rolled upon itself in thefilling operation, whereas in my device the diaphragm is adapted to betwisted to produce the same result.

The principal object of my invention is to provide a pump ll structure,the mechanical construction of which is such that a greater vacuum willbe created within the pen barrel upon actuation `of the pump than isfound in other structures 'of the same type.'

Another object is to' provide a mechanism which 1 is exceedingly simplein construction and economical to manufacture.

rear end of a pen barrel with my improved pump' mechanism mountedtherein;

Fig. 3 is a view partially fragmentary and partially plan of my improvedpump unit;

Fig. 4 is a plan view of a sleeve which forms a part of my invention.

n In the -drawing the numeral I 0 will be used generally to indicate thebarrel of a fountain pen and the 4numeral Il the section thereof. 'A niband feed assembly I2 are fitted into the open end of the section, thefeed being longitudinally drilled to receive a vent tube I3 throughwhich air from within the barrel is vented upon actuation of the pumpmechanism. rIhefeed is providedi with the ordinary ink channels toconvey ink from the interior of thebarrel tc the pen point. A

The barrel I0 is axially drilled to provide an ink reservoir I4 and therear end of the said chamber so formed is internally threaded as at I 5to receive the pump unit. The pump unit consists of a threaded bushingI6 havingla reducedl threaded end I1. The said threaded end isadapted toreceive an internally threaded blind cap I8 which serves to cover theotherwise exposed end of the pump. The bushing I 6 is also reduced atthe opposite end, the reduced portion being I5 tapered to receive arubber diaphragm I9, which is aiiixed tothe said tapered reduced portionof the bushing I6 through the medium of a tapered collar 20 which isforced onto the taperedend of the bushing I6 after assembly of the skirtof the 10 diaphragm thereover.

Grooves 2l are milled in the surface of the tapered end of the bushingI6 in order to more eiiectually affix the diaphragm to the tapered endof the bushing as portions of the rubber skirt l5 of the diaphragmbetween the collar'and the bushing will be forced into the grooves,ythus firmly afilxing the diaphragm to the bushing I 6.

The opposite end of the diaphragm -isclosed 20 and is ailixed to aplunger 22 .in much the same manner as the skirt portion of the saiddiaphragm is fixed to the bushing I6. The plunger 22 has an enlargedtapered head 23 having grooves 2t milled therein. The head of theplunger is inserted through the open end of the diaphragm to the closedend thereof, and a tapered collar 25 is forced over the said closed end,thus ailixing the said end of the diaphragm to the enlarged tapered endof the plunger. The upper end of the plunger is approximately twice thediameter of the plunger ste'm and is adapted to extend through thebushing I6 in order that the dia*n phragm may be actuated. That part ofthe said plunger extending from the bushing is enlarged and knurled asat 26 in order that the user may have a better grasp on it.`

A sleeve 2l is force fitted into the top open end of the bushing untilthe outer end of the said sleeve is ush with the top of the saidbushing. l'I'he said sleeve 21 has a spiral slot 28 stamped thereinthepurpose of which will be explained hereinafter. A lug 29 is press fittedinto a drill hole 30 in the plunger stem and the end of the lug isadapted to project from the wall of the plunger a suiiicient distance ast6 engage the spiral slot 28 and the sleeve 21. In order to effect theassembly of the lug within the spiral slot, it is necessary that thesleeve -'-2'l be sprung over the vlug prior to the force fitting of thesaid sleeve within the bushing.

The assembled pump unit is then screwed into the upper threaded end Aofthe barrel until the shoulder formed by reduction of the outer threadedend is ush with thetop edge of the said 65 barrel, whereupon themechanism is readyl for use.

'I'he pump functions as follows:

The userl removes the blind capl I8 and grasps the projecting end of theplunger 26. The point end of the pen is inserted in ink and the plungerstem rotated, which action, because the opposite end of the plunger isfixed to the closed end of the diaphragm and the open end of thediaphragm is amxed to the stationeryv bushing I6, will cause the saiddiaphragm to be twisted, and due to the displacement of the diaphragmbulk will cause the air pressure to be lowered within the barrelcreating a partial vacuum therein causing ink to be sucked through thesection into Y the said barrel.

It is to be particulars' noted that due to the engagement of the pin 29in thevspiral slot 28 s,os7,177 i phragm twists due to actuation of theplunger,

it naturally tends to shorten and as the plunger recedes from theinterior of the barrel simultaneously with the shortening of thediaphragm, the combined twisting and shortening of the dia.- phragm willcause a greater air displacement to be had within the barrel than werethe plunger to be rotated in the same plane. The fact that greaterdisplacement is effected will increase the vacuum Within the pen barrelIand more ink will be drawn thereinto and it will necessitate feweractuations of the plunger to effect the complete lling of the pen.

Having described my invention, what I claim and desire to secure byLetters Patent is:

In a fountain pen, an ink reservoir barrel, having at one end passagesfor ink and air, combined with a twist-sac located within, supported at,and vented toward the other end of the barrel, and having an imperviouswall extending into the reservoir; and a rotatable element engagingtorsionally a deep part of the sac, thereby by twisting the sac tochange displacement of the reservoir; and means for limiting thetwisting of the sac to less than a full rotation of said rotatableelement.

NATHAN W. PAQUE'I'I'E.

